Timepiece dial plate and timepiece dial plate manufacturing method

Abstract

A timepiece dial plate comprises an upper plate ( 1 ) provided with holes ( 2, 4 ) and positioning legs ( 3 ) projecting from its lower surface so as to position the upper plate ( 1 ) relative to a movement; and a lower plate ( 11 ) provided on its upper surface with solid indices ( 12 ) to be fitted in the holes ( 2 ) of the upper plate ( 1 ) so as to protrude from an upper surface of the upper plate ( 1 ), and provided with holes ( 13 ) through which the positioning legs ( 3 ) of the upper plate ( 1 ) are extended. The upper plate ( 1 ) and the lower plate ( 11 ) are superposed so that the solid indices ( 12 ) of the lower plate ( 11 ) are fitted in the holes ( 2 ) of the upper plate ( 1 ), respectively, and protrude from the upper surface of the upper plate ( 1 ), and the positioning legs ( 3 ) of the upper plate ( 1 ) extend through the holes ( 13 ) of the lower plate ( 11 ), respectively.

What is claimed is:  
     
       1. A timepiece dial plate comprising: 
       an upper plate provided with holes, and positioning legs projecting from its lower surface so as to position the upper plate relative to a movement; and  
       a lower plate provided on its upper surface with solid indices to be fitted in the holes of the upper plate so as to protrude from an upper surface of the upper plate, and provided with holes through which the positioning legs of the upper plate are extended;  
       wherein the upper plate and the lower plate are superposed so that the solid indices of the lower plate are fitted in the holes of the upper plate, respectively, and protrude from the upper surface of the upper plate, and the positioning legs of the upper plate extend through the holes of the lower plate, respectively.  
     
     
       2. The timepiece dial plate according to claim  1 , the upper plate has a thickness greater than that of the main part of the lower plate. 
     
     
       3. The timepiece dial plate according to claim  1 , wherein the indices are formed integrally with a main part of the lower plate. 
     
     
       4. The timepiece dial plate according to claim  1 , wherein the lower plate has a flat lower surface, the upper plate has a flat upper surface. 
     
     
       5. The timepiece dial plate according to claim  1 , wherein both the upper and the lower surface of the upper plate are flat. 
     
     
       6. The timepiece dial plate according to claim  1 , wherein the indices are hollow and have concave back surfaces. 
     
     
       7. The timepiece dial plate according to claim  2 , wherein the upper plate has a thickness at least twice as great as that of a main part of the lower plate. 
     
     
       8. A timepiece dial plate manufacturing method comprising the steps of: 
       forming an upper plate provided with holes and positioning legs projecting from its lower surface to position the upper plate relative to a movement;  
       forming a lower plate provided on its upper surface with solid indices to be fitted in the holes of the upper plate so as to protrude from an upper surface of the upper plate, and provided with holes through which the positioning legs of the upper plate are extended; and  
       superposing the upper plate and the lower plate so that the solid indices of the lower plate are fitted in the holes of the upper plate, respectively, and protrude from the upper surface of the upper plate, and the positioning legs of the upper plate extend through the holes of the lower plate, respectively.  
     
     
       9. The timepiece dial plate manufacturing method according to claim  8 , wherein the lower plate is formed by using a pattern having on it surface with protrusions corresponding to the indices and provided with holes corresponding to the holes through which the positioning legs are extended. 
     
     
       10. The timepiece dial plate manufacturing method according to claim  8 , wherein the lower plate is formed by an electroforming process using a pattern having on it surface with protrusions corresponding to the indices and provided with holes corresponding to the holes through which the positioning legs are extended. 
     
     
       11. The timepiece dial plate manufacturing method according to claim  8 , wherein the indices are formed integrally with a main part of the lower plate. 
     
     
       12. The timepiece dial plate manufacturing method according to claim  8 , wherein the lower plate has a flat lower surface, and the upper plate has a flat upper surface. 
     
     
       13. The timepiece dial plate manufacturing method according to claim  8 , wherein both the upper and the lower surface of the upper plate are flat. 
     
     
       14. The timepiece dial plate manufacturing method according to claim  8 , wherein regions of the lower surface of the lower plate corresponding to the indices are concave. 
     
     
       15. The timepiece dial plate manufacturing method according to claim  8 , wherein the upper plate has a thickness greater than that of the main part of the lower plate. 
     
     
       16. The timepiece dial plate manufacturing method according to claim  8 , wherein the upper plate has a thickness at least twice as great as that of a main part of the lower plate. 
     
     
       17. The timepiece dial plate manufacturing method according to claim  8 , wherein the lower plate is formed by an electroforming method.